Solve the following system. 4x2 + 9y2 =72 x2 - y2 = 5 the solutions areand () (remember to include the commas) there has to be 4 solutions all ordered pairs

 The required solutions are

Step-by-step explanation:  We are given to solve the following system of equations:

Let us consider that

So, equations (i) and (ii) becomes

Multiplying equation (iv) by 4 and then subtracting from equation (iii), we get

From equation (iv), we get

Therefore,

Thus, the required solutions are

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.